Precision molecular spectroscopy with a phase-locked terahertz quantum-cascade laser
Artikel i vetenskaplig tidskrift, 2025
We demonstrate precision molecular spectroscopy with a phase-locked quantum cascade laser (QCL) over its entire frequency tuning range at 3.4 THz. A Schottky diode harmonic mixer is used to mix the QCL emission with a multiplied microwave signal, referenced to a rubidium frequency standard, to create an intermediate frequency (IF) signal, which is used to phase-lock the QCL. Tuning the frequency of the multiplied microwave reference and keeping the IF fixed allows for precise frequency control of the laser. We identify ten methanol transitions between 3443.5 and 3447.6 GHz and quantify the transition frequencies and broadening parameters with high precision. These measurements are performed without liquid cryogens in a compact setup.
Författare
Robert Voigt
Humboldt-Universität zu Berlin
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Martin Wienold
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Divya Jayasankar
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Jan Stake
Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik
Xiang Lü
Paul Drude Institut fur Festkorperelektronik
Klaus Biermann
Paul Drude Institut fur Festkorperelektronik
Heinz-Wilhelm Hübers
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Humboldt-Universität zu Berlin
Optics Express
1094-4087 (ISSN) 10944087 (eISSN)
Vol. 33 7 15782-15788Supraterahertzelektronik för framtida FIR instrument
Rymdstyrelsen (2023-00310), 2024-01-01 -- 2027-12-31.
Infrastruktur
Kollberglaboratoriet
Styrkeområden
Nanovetenskap och nanoteknik
Ämneskategorier (SSIF 2025)
Elektroteknik och elektronik
DOI
10.1364/OE.553739